I changed over from TTax several years ago and have never looked back. Great product and I find it easy to use the "forms" to input my raw data and then proceed to go through the interview to ensure nothing is missed. Works well!
After years of using the other software program, it became somewhat expensive for my simple returns. So, I switched to H&R Block. This is my second year using the program. I am quite satisfied with it, and would say it is simpler to use and less expensive.
Pros: Easy to prepare, Maximizes refund, Easy to import documents, Fast